Santhosh Kannan

Freelance Software Engineer

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Berlin, Germany

Experience

Aug 2024 - Present
1 year 6 months
Berlin, Germany

Freelance Software Engineer

Zalando SE

  • Support Authorization as a Service initiative for enterprise-scale authorization platform
  • Incorporate comprehensive observability solutions into authorization infrastructure
  • Provision and manage AWS infrastructure for authorization services
  • Mentor development team on AWS and Kubernetes best practices
  • Tech Stack: Java/Kotlin, Golang, Python, OPA, Spring Boot, AWS, Kubernetes, Terraform, ELK Stack, Prometheus, Grafana
Apr 2023 - Aug 2024
1 year 5 months
Berlin, Germany

Freelance Platform Engineer

apinity GmbH

  • Bootstrap platform components and enhance infrastructure as code implementations
  • Develop custom Kubernetes operators (Golang/Rust) for automated tenant resource provisioning
  • Lead migration initiatives toward GitOps methodologies
  • Tech Stack: Azure, Kubernetes, Terraform, Java/Kotlin, Golang, Rust, Elasticsearch, Kube Prometheus Stack, Grafana, Helm, ArgoCD
May 2022 - Apr 2023
1 year
Berlin, Germany

Freelance Software Engineer

MediaMarktSaturn

  • Delivered full-stack features across frontend and backend systems
  • Mentored development team on GCP and Kubernetes best practices
  • Supported organizational migration to GitOps workflows
  • Tech Stack: Java/Kotlin, Spring, GCP, Kubernetes, Terraform, React/TypeScript, Kube Prometheus Stack, Grafana, FluxCD
Jul 2021 - Oct 2022
1 year 4 months
Berlin, Germany

Senior DevOps Engineer

smava GmbH

  • Facilitated datacenter-to-AWS migration for legacy applications
  • Optimized Kubernetes infrastructure, monitoring, and end-to-end testing processes
  • Enhanced team capabilities through feature development support
  • Tech Stack: AWS, Kubernetes, Terraform, CDK, Golang, Ansible, Java, EFK Stack, Prometheus, Thanos, Grafana
Mar 2021 - Mar 2022
1 year 1 month
Berlin, Germany

Freelance Software Engineer

Zalando SE

  • Developed new features using Kotlin and Scala within microservices architecture
  • Provided technical mentorship on AWS, Kubernetes, and Spring ecosystem
  • Contributed to cross-functional team development initiatives
  • Tech Stack: Java/Kotlin/Scala, Spring Boot, AWS, Kubernetes, TypeScript, React.js, Rust, Prometheus, Grafana
Jan 2021 - Mar 2021
3 months
Berlin, Germany

Freelance Software Engineer

MediaMarktSaturn

  • Enhanced team capabilities through feature development and implementation
  • Implemented retry mechanism leveraging Kafka state store for improved reliability
  • Integrated Prometheus metrics across services with Istio service mesh
  • Tech Stack: Kotlin, Koin, Http4k, GCP, Kubernetes, Terraform, Istio, Prometheus, Grafana, Kafka Streams
Jun 2020 - Dec 2020
7 months
Berlin, Germany

Lead Engineer (Freelance)

Heycar

  • Led platform expansion to new geographic markets
  • Architected and implemented AWS/Kubernetes infrastructure for regional rollout
  • Designed multi-tenancy solutions for core platform services
  • Integrated third-party services for stock management and marketing automation
  • Tech Stack: Java/Kotlin, Spring Boot, AWS, Kubernetes, Terraform+CFN, CDK, Golang, TypeScript, React.js (Next.js), Prometheus, Grafana, ELK Stack
Nov 2019 - Apr 2020
6 months
Berlin, Germany

Freelance Software Engineer

Zalando SE

  • Architected and implemented core services in Kotlin
  • Migrated legacy applications to modern Kotlin-based architecture
  • optimized frontend deployment pipeline using CloudFront and S3
  • Developed automation tools using Rust for PR management
  • Tech Stack: Java/Kotlin/Scala, Spring Boot, AWS, Kubernetes, TypeScript, React.js, Next.js, Rust, Prometheus, Grafana
Dec 2016 - Oct 2019
2 years 11 months
Berlin, Germany

Senior Software Engineer

ImmobilienScout24 GmbH

  • Integrated multiple payment providers and payment method implementations
  • Led application migration from on-premises datacenter to AWS cloud
  • Modernized frontend stack from legacy JSP/Angular to TypeScript/React.js
  • Automated build pipeline migration from TeamCity to Jenkins using Rust tooling
  • Tech Stack: Java 11, Spring Boot, AWS SDK, Kinesis, TypeScript, React.js (Next.js), Docker, ELK Stack, Grafana, Prometheus, CloudWatch
Feb 2015 - Nov 2016
1 year 10 months
Berlin, Germany

Senior Java Developer

ProfitBricks GmbH

  • Refactored legacy codebase and eliminated deprecated framework dependencies
  • Resolved critical 4-year-old memory leak through performance profiling and GC tuning
  • Contributed to Terraform module development for ProfitBricks Cloud platform
  • Established automated CI/CD pipeline using Jenkins
  • Tech Stack: Java 7/JEE, GlassFish, PostgreSQL, Dropwizard, Kubernetes (0.x), Terraform, Jenkins, GitLab CI
Jul 2005 - Jan 2015
9 years 7 months

Lead/Senior Software Engineer

CSC

  • Delivered software solutions across multiple client projects and geographic locations
  • Implemented automation solutions and established development best practices
  • Provided technical leadership and emergency support for critical systems
  • Tech Stack: JVM ecosystem, ALSB 2.5, WebLogic 9.2, J2ME

Summary

Senior Full-Stack Developer and Platform Engineer with nearly two decades of expertise in Java, Kotlin, Scala, and cloud infrastructure (AWS, Azure, GCP). Specialized in Kubernetes orchestration, Infrastructure-as-Code, microservices architecture, and modern frontend development. Proven track record in platform migrations, DevOps automation, and technical mentorship across fintech, e-commerce, and automotive industries.

Skills

  • Programming Languages: Java, Kotlin, Scala, Rust, Golang, Python, Typescript, Javascript
  • Cloud Platforms: Aws, Azure, Google Cloud Platform (Gcp)
  • Container & Orchestration: Kubernetes, Docker, Istio, Helm, Linkerd
  • Infrastructure As Code: Terraform, Cloudformation, Cdk, Pulumi, Saltstack, Ansible
  • Backend Frameworks: Spring Boot, Dropwizard, Play Framework, Http4k, Ktor, Hibernate
  • Event Streaming & Messaging: Apache Kafka, Aws Kinesis, Sns, Sqs, Azure Eventbus, Rabbitmq
  • Frontend Technologies: React.js, Next.js, Typescript, Angular, Svelte, Jquery
  • Databases: Postgresql, Oracle, Mysql, Db2, Mongodb
  • Ci/cd & Build Tools: Jenkins, Github Actions, Circleci, Teamcity, Maven, Gradle, Sbt, Cargo, Gitlab
  • Monitoring & Observability: Kube Prometheus Stack, Grafana, Elk/efk Stack, Datadog, Cloudwatch, Azure Monitor
  • Web Services & Integration: Rest, Soap, Graphql, Esb, Json, Xml, Web Services
  • Application Servers: Tomcat, Weblogic, Websphere, Jboss, Glassfish
  • Methodologies: Agile, Scrum, Kanban, Devops, Gitops

Languages

English
Advanced
German
Intermediate

Education

Jul 2002 - May 2005

PSG College of Technology

Master of Computer Applications, MCA · Computer Applications · Coimbatore, India

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